We are excited to announce the availability of Cluster Compute Instances for Amazon EC2, a new instance type specifically designed for high-performance computing (HPC) applications and other demanding network-bound applications. Customers with complex computational workloads such as tightly coupled parallel processes, or with applications sensitive to network performance, can now achieve the same high compute and network performance provided by custom-built infrastructure while benefiting from the elasticity, flexibility and cost advantages of Amazon EC2.